Sprocket-wheel for drive-chains.



' No. 717,976. PATENTED JAN. 6, 1903.

J. M. DODGE.

SPROGKBT WHEEL FOR DRIVE CHAINS.

APPLIGATION FILED NOV. 7 1901.

1T0 MODEL. 2 SHEETS-SHEET 1.

No; 717,976, PATENTED iAN. 6,1903. .I. M. DODGE. SPROGKE'I' WHEEL FOR DRIVE CHAINS.

APPLIOATION FILED NOV. 7, 1901. N0 MODEL. 1 2 SHEETS-SHEET 2.

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UNITED STATES PATENT OFFICE.

JAMES M. DODGE, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE LINK BELT ENGINEERING COMPANY, OF PHILADELPHIA, PENNSYL- VANIA, A CORPORATION OF PENNSYLVANIA.

SRROCKET-WHEEL FOR DRIVE-CHAINS.

SPECIFICATION forming part of Letters Patent N 0. 717,976, dated January 6, 1903.

Application filed November 7, 1901. Serial No. 811445. (No model.)

T ctZZ whom i mal concern: "accommodate themselves to the wheel, and Be it known that I, JAMES M. DODGE, a citiwhen both the chain andwheel are new the zen of the United States, residinginPhiladeldistance between the center of the pivots of phia, Pennsylvania, have invented certain the links will be such as to cause the chain to Improvements in Sprocket-Wheels forDrivefind its seat upon the wheel and separate the 55 Chains, of which the following is a specificatwo sections until it seats at the proper beartion. ing, as in Fig. 7, the spring-section yielding My invention relates to certain improvesufficiently to allow for the properseating of ments in the sprocket-wheels of drive-chains, the chain. As the chain and the teeth of the particularly those adapted to receive the orwheel wear and the chain begins to elongate 6o dinary open-link chain. then the pitch-circle of the chain will be in- The object of my invention is to takeup all creased, and the chain will seek another bearslack of the said chain by means of the yielding farther from the center of the wheel, as ing teeth of the wheel, as fully described in Fig. 8, and the spring-section B will move hereinafter. toward the pivot of the chain and take up In the accompanying drawings, Figure 1 is the lost motion which would otherwise occur a side view of my improved sprocket-wheel. between the wheel and the chain, so that by Fig. 2 is a side view. Fig. 3 is a section on this arrangement I am enabled to make a the line 3 3, Fig. 1. Fig. 4 is a section on the comparatively noiseless driving-gear with the 20 line at 4, Fig. 1. Figs. 5 and 6 are views of use of an ordinary pivoted-link chain.

the two parts of the Wheel separated, and I claim as my invention- Figs. 7 and 8 are diagramviews. 1. A sprocket-wheel made in two parts, one

A and B are two disks which form the wheel. part movable in respect to the other part, The disk A has a series of teeth a, inclined on each part having a series of laterally-project- 25 the working face, and the disk B has a series ing teeth, the teeth of one part projecting into of teeth I), also having one face inclined. the spaces between the'teeth of the othetpart, When the two disks are placed face to face, substantially as described. as in Fig. 2, the teeth of one disk alternate 2. A sprocket-wheel made in two parts, one with the teeth of the other disk, as in Fig. 1. part movable in respect to the other part,

30 Each tooth projects from the inner face, so each part havinga series of laterally-projectas to extend into the space between the teeth ing teeth, the teeth of one part extending of the adjoining disk, as illustrated in Figs. into the spaces between the teeth of the other 3 and 4, so that when the two parts are aspart, the teeth being arranged in pairs,the sembled there is simply one series of teeth. working faces of each pair facing each other,

5 In the present instance the diskAis the drivwith a yielding means for drawing the teeth ing-disk and is secured to the shaft C by of each pair toward each other, substantially means of a key 0 and set-screw c, and the as described. disk B is the take-up and is free to rotate on 3. The combination of a sprocket wheel the shaft to a limited extent and is held in made in two parts, a shaft to which one of 0 place by means of acollar or other device. said parts is secured, the other part being 9c Projecting from the face of the disk A are loose on the shaft, teeth on each part'having two lugs a. a, and projecting from the inner laterally-projecting portions, theprojecting face ofthedisk B are'two lugs Z) Z), which teeth on one part extending into the spaces extend through openings 8 e in the disk A. between the teeth of the other part, the teeth 5 Between the lugs a and b are springs E, which being arranged in pairs, the working faces of 5 tend to force the lugs apart, forcing the teeth each pair facing each other, with a spring of the disk B toward the-teeth of the disk A. tending to draw the teeth of each pair to The pivots of the chains enter the space begether, substantially as described. tween the two inclined bearing-faces of the 4:. The combination of a shaft, a sprocket 50 teeth of the two sections of the wheel and wheel made in two parts, each having teeth, 10o

the teeth of one part having lateral projections which extend into the spaces between the teeth of the other part, each tooth having an inclined working face, the teeth being arranged in pairs forming V-shaped recesses for the pivots of the chain, and a spring between the two parts of the sprocket-wheel for drawing the teeth of each pair together, substantially as described. 7

5. The combination of a shaft C,a sprocketwheel made in two parts A and B, the part A being secured to the shaft, the part B loose on the shaft, the part A having lugs on one side and openings, the part B having lugs extending through the openings, springs mount- Witnesses:

WILL. A. BARR, J os. H. KLEIN, 

